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Linear Technology Electronic Components Datasheet

LTC3355EUF Datasheet

20V 1A Buck DC/DC

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FEATURES
nn VIN Voltage Range: 3V to 20V
nn VOUT Voltage Range: 2.7V to 5V
nn 1A Current Mode Buck Main Regulator
nn 5A Boost Backup Regulator Powered from Single
Supercapacitor
nn Boost Regulator Operates Down to 0.5V for
Maximum Utilization of Supercapacitor Energy
nn Programmable Supercapacitor Charge Current to
1A with Overvoltage Protection
nn Charger Supports Single Cell CC/CV Battery Charging
nn Programmable VIN Current Limit
nn Programmable Boost Current Limit
nn VIN Power Fail Indicator
nn VCAP Power Good Indicator
nn VOUT Power On Reset Output
nn Compact 20-Lead 4mm × 4mm QFN Package
APPLICATIONS
nn Ride-Through “Dying Gasp” Supplies
nn Power Meters/Industrial Alarms/Solid State Drives
LTC3355
20V 1A Buck DC/DC with
Integrated SCAP Charger
and Backup Regulator
DESCRIPTION
The LTC®3355 is a complete input power interrupt ride-
through DC/DC system. The part charges a supercapacitor
while delivering load current to VOUT, and uses energy from
the supercapacitor to provide continuous VOUT backup
power when VIN power is lost. The LTC3355 contains a
nonsynchronous constant frequency current mode mono-
lithic 1A buck switching regulator to provide a 2.7V to 5V
regulated output voltage from an input supply of up to 20V.
A 1A programmable CC/CV linear charger charges the
supercapacitor from VOUT. When the VIN supply drops
below the PFI threshold, the devices’s constant frequency
nonsynchronous current mode 5A boost switching
regulator delivers power from the supercapacitor to VOUT.
A thermal regulation loop maximizes charge current while
limiting the die temperature to 110°C. The IC has boost,
charger and VIN programmable current limits. The LTC3355
is available in a 20-lead 4mm × 4mm QFN surface mount
package.
L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks
of Linear Technology Corporation. All other trademarks are the property of their respective
owners.
TYPICAL APPLICATION
Supercapacitor Charger and Ride-Through Power Supply
VIN
12V 10µF
0.091Ω
10µF
2.49M
200k
5 VIN
1µF
6 VINM5
4 VINS
1 PFI
SW1 7
PFO
BUCK VOUT 15
1A
FB 2
10 PFOB
13 RSTB
9 CPGOOD
8 EN_CHG
3 MODE
INTVCC
18
LTC3355
BOOST
ICHG
12
VCAP 14
SW2
16
17
CFB 11
VCBST 19
IBSTPK
20
1µF 60.4k 200k
6.8µH
4.7pF 402k
100k
3.3µH
665k
154k
220pF
3355 TA01a
332k
VOUT
4V
47µF 1A (MAX)
2.4V
SCAP
1F TO 50F
For more information www.linear.com/LTC3355
Backup Operation
14
CAPACITOR = 3F
12
IVOUT = 0.125A
10
VIN
8
6
VOUT
4
VCAP
2
0
0
5
10
15
20
TIME (SECONDS)
3355 TA01b
3355fb
1


Linear Technology Electronic Components Datasheet

LTC3355EUF Datasheet

20V 1A Buck DC/DC

No Preview Available !

LTC3355
ABSOLUTE MAXIMUM RATINGS
(Note 1)
VIN, VINS, VINM5.........................................................22V
VIN ±VINS................................................................... 0.1V
VSW1........................................................... –0.4V to 22V
VSW2............................................................. –0.4V to 6V
VOUT, INTVCC, PFOB, RSTB,
CPGOOD, VCAP.............................................. –0.3V to 6V
PFI, EN_CHG, MODE, FB............................... –0.3V to 6V
CFB.............................................–0.3V to INTVCC + 0.3V
ICPGOOD, IPFOB, IRSTB.................................................1mA
Operating Junction Temperature Range
(Notes 2, 3)............................................. –40°C to 125°C
Storage Temperature Range................... –65°C to 150°C
PIN CONFIGURATION
TOP VIEW
PFI 1
FB 2
MODE 3
VINS 4
VIN 5
20 19 18 17 16
15 VOUT
14 VCAP
21
GND
13 RSTB
12 ICHG
11 CFB
6 7 8 9 10
UF PACKAGE
20-LEAD (4mm × 4mm) PLASTIC QFN
TJMAX = 125°C, θJA = 47°C/W
EXPOSED PAD (PIN 21) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
LTC3355EUF#PBF
LTC3355EUF#TRPBF
3355
20-Lead (4mm × 4mm) Plastic QFN
LTC3355IUF#PBF
LTC3355IUF#TRPBF
3355
20-Lead (4mm × 4mm) Plastic QFN
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on nonstandard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
TEMPERATURE RANGE
–40°C to 125°C
–40°C to 125°C
3355fb
2
For more information www.linear.com/LTC3355


Part Number LTC3355EUF
Description 20V 1A Buck DC/DC
Maker Linear
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